The population of the world still now.A. has; grown B. is; growing C. will; grow D. is;

问题补充：

The population of the world still now.

A. has; grown

B. is; growing

C. will; grow

D. is; grown

答案：

A. has; grown

(答案→)B. is; growing

C. will; grow

D. is; grown

解析：句意：现在世界上的人口仍旧在继续增长。结合语境可知本句描述的是现在正在进行的动作，故用现在进行时态，选B。